Bezier's surface

Bezier's surface for operative network M with parameters
(m+1) x (n+1) dots is defined by parametric formulation:
where are Bernstein
polynom for u and v̼
<0,1>.

Applet: Bezier's surface, select with a mouse one from command point in left-top and move it with a key: in line of axis x (q , w -), in line of axis y (e +,
r -), in line of axis z (t +, y -), with keys 1-6 you can change axonometry